MJ's 71 Beaver (Dart)

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  1. mj's friend

    mj's friend Member

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    This will be the official build thread for MJ’s 1971 beaver (supposedly demon dart). Long story short, mj is my work buddy. We work at a turbine engine overhaul shop in az. I’m a mechanic and he was one of my inspectors. He just took a job in management so he has less time than ever to make a build thread. I told him I’d make the build thread and he will chime in when he’s not looking down the barrel of a shotgun contemplating his recent career move. We’ll probably pester you guys with stupid questions within this thread. Feel free to pound the keyboard in anger with caps lock on, we won’t be offended.
    dart front.jpg
    dart ass.jpg

    The car had a slant 6 and auto that we just pulled out. The car is in decent shape. We’re just working on getting the mechanicals in order. No cares for body work at the moment and the interior is just fine for now.

    The donor engine/trans combo going in is a 383 and going with a 440 source stroker kit/stealth heads and a 727 trans that’s gonna be gone thru. The motor seems to be a 1969 with 906 heads. It was said to have had a spun rod bearing. It did indeed. The Shumacher slant 6 to BBM mounts recently arrived. We'll probably dump the bare block in to test fit and notch the k member.
    383.jpg

    The rear was a 7.25” or whatever tf, no one cares. Mj picked up a fully built 8.75”, 3.23 ratio with new suregrip and 5x4.5” axles and a 7290 yoke . Don’t ask how much it was but it’s beautiful and it’s A body dimensions. Driveshaft will be measured once the motor and trans are in the car. Rear suspension will likely be caltracs and split mono leaf springs from calvert as well. Wouldn't mind sticking with rear drums but we have nothing to start with as of now so suggestions are welcome.
    axle housing.jpg diff.jpg

    Here's the aluminum radiator that was in it with the slant 6. The question is will it be big enough for the big block?
    rad width.jpg radiator depth.jpg

    That's it for now, I just wanted to get this thread going. We'll have questions and want opinions on front suspension, disk brake conversion, subframe connectors, engine/trans stuff... Just pretty much everything. So far 440 source seems like a good vendor for engine components. P-S-T for suspension rebuild and Brakes. Shumacher for the mounts.

    Any and all advice is welcome, even if its "sell it all to save your marriage, buy a street bike instead!"
     
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    • Stranglehold

      Stranglehold Well-Known Member

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      Nice! I just received Schumacher mounts about a month ago for my 340, they were scarce. Haven't fitted them yet. Cool build!
       
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      • Garrett Ellison

        Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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        How much crank you putting into the 383? The radiator may be okay if it's got the 1 inch (or are they 1 and fractional, I forgot?) pass tubes in it. But in Arizona, it may take a 3 row radiator with large pass tubes, and a high flow water pump such as a FlowKooler or PRH.
         
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        • Murray

          Murray FABO Gold Member FABO Gold Member

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          We specialize in stupid questions.
           
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          • CFD244

            CFD244 These pretzels are making me thirsty. FABO Gold Member

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            Can't wait to see the progress. Good luck.:popcorn:
             
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            • Darter6

              Darter6 Well-Known Member

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              Looks like a great starting point. Not too many unmolested 71/72 Demons around anymore.
              For those that don't know the BEAVER was the other name that Dodge was thinking about using.
              Glad the Demon name won .
              As far as cooling the 383 you might get by with the radiator you have, but may find the lower hose is on the wrong side.
               
            • barbee6043

              barbee6043 barbee 6043 FABO Gold Member

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              Good luck! Any AC in that garage????
               
            • Plymouth 65

              Plymouth 65 Floorable Deplorable

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              Love Demons, looks to be a solid foundation for a great sounding build. 65'
               
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              • ACME SS

                ACME SS Well-Known Member

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                It looks like a great project and in the right hands. My 71 demon was also born a 6 cylinder but now has a 318 and I have been unhappy with the feel of it at highway speeds. I had a 6 cylinder Demon in high school and I don't remember it being scary to drive. I got a lot of good suggestions when I posted a question but one in particular got my attention. Apparently these cars came with a front sway bar when equipped with a V-8 (someone may correct me but that was my take on it). I just received a Hellwig sway bar and plan to install it this week in hopes it will tighten up the front. It may be something to consider with that monster you are installing.
                 
              • mj's friend

                mj's friend Member

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                Yeah I saw they had a lot that were out of stock. We were lucky the slant 6 to bbm a-body motor mounts were one of the few in stock
                 
                Last edited: May 14, 2022
              • mj's friend

                mj's friend Member

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                I’m thinking I have mj talked into the 3.75” stroke (434” iirc). I like a good rod angle. And not clearancing the block. Keeping 255 drag radials somewhat planted to the ground will be difficult no matter what with a warmed over big block, the 496” rotating assembly seems excessive.

                as for the radiator I’m not sure about the internals, I didn’t look at it too hard. I think we’ll give it a try and just keep a close eye on the temp gauge.
                 
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                • mj's friend

                  mj's friend Member

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                  Interesting. We’ll be going in with the bigger torsion bars but a swaybar is not out of the question. Luckily the heads will be lighter and I think the rotating assemblies from 440 source claim to be lighter than factory components as well but it’s still gonna be a pig with the big block in the front.
                   
                • mj's friend

                  mj's friend Member

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                  It’s not bad yet. I’ve lived here my whole life and done motor swaps on 117* days with no ac and it sucks. But it’s doable (iTs a dRy hEaT). I’m hoping this motor isn’t ready until September or later. We still need to get rear suspension and brakes under it and rebuild the front susp and convert to disk before we get to excited about engine work.
                   
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                  • mj's friend

                    mj's friend Member

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                    God dammit . I need to look at more pics of bb swaps. Thanks
                     
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                    • barbee6043

                      barbee6043 barbee 6043 FABO Gold Member

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                      S E TEXAS! It ain't the heat that kills ya, its the humidity (and lack of wind!).
                      Yea dry heat as in a friggin OVEN!!!!!!
                      You know the humidity might be just a little high, when the sweat has run off ya balls and your boots are soaking WET!!!!:poke:
                       
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                      • French demon

                        French demon Well-Known Member

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                        Correct me if I'm wrong, but my '71 slant-six Demon has a front sway bar. Was it an option? Maybe standard with front disc brakes?
                        (sorry, no better pic)
                        sway bar.jpg
                         
                        Last edited: May 14, 2022
                      • A56

                        A56 MoPar Affliction FABO Gold Member

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                        Fender Tag Option Code S31 is 70-71 only for front sway bar. I would think maybe it's part of a towing package, or suspension upgrade. or someone added it later on. I see you have power disk brakes which may have been part of this upgrade. Check your fender tag and or build sheet if available.
                         
                      • A56

                        A56 MoPar Affliction FABO Gold Member

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                        ...and contribute them
                         
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                        • French demon

                          French demon Well-Known Member

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                          :thankyou:
                          No S31 code on the fender tag, nor on the build sheet.
                          But the number 39 in the "FT S/BAR" build sheet box (fourth line)

                          Front sway bar 39.jpg
                           
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                          • mygasser

                            mygasser FABO Gold Member FABO Gold Member

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                            it's easy enough to move the hose fitting on ally rad's if you want to go ahead with what you have.
                             
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                            • Darter6

                              Darter6 Well-Known Member

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                              Not sure of the year but around 1975 on the big block Cordoba/Charger the lower hose is on the passenger side. You may try from 75-(78 the last year) for a big block water pump housing . Don't quote me on this but maybe.
                               
                            • mj's friend

                              mj's friend Member

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                              This is why we’re here
                               
                            • TheGrateRonzini

                              TheGrateRonzini Well-Known Member

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                              440 source offers a pass side inlet water pump housing
                               
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                              • ACME SS

                                ACME SS Well-Known Member

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                                Hmmm. bigger torsion bars... not a bad idea
                                 
                              • rumblefish360

                                rumblefish360 I have escaped the evil Empire State! FABO Gold Member

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                                Your correct, I did the below.
                                They sure do and I did it myself. The housing and pump made of aluminum saves a lot of weight.
                                I ran my 400/727 w/ the /6 bars. It’s not what I’d recommend but it was something I got used to quickly.

                                @mj’ s friend
                                @mj’s friend
                                @mj’sfriend
                                @mj's friend
                                (WTF is going on here?)
                                both if need be here… LOL!

                                I also used a Summit racing aluminum radiator. It made the stock fan a no go. Watch your thickness on the radiator.
                                 
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